content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import com.google.protobuf.UnittestLite.TestAllExtensionsLite;
  import com.google.protobuf.UnittestLite.TestAllTypesLite;
  import protobuf_unittest.UnittestProto;
  import protobuf_unittest.UnittestProto.ForeignEnum;
  import protobuf_unittest.UnittestProto.TestAllExtensions;
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import protobuf_unittest.UnittestProto.TestEmptyMessage;
  import protobuf_unittest.UnittestProto.TestPackedExtensions;
  import protobuf_unittest.UnittestProto.TestPackedTypes;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Bar;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Foo;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Map;
  import junit.framework.TestCase;
  
  /**
   * Tests for {@link UnknownFieldSetLite}.
   *
   * @author dweis@google.com (Daniel Weis)
   */
  public class UnknownFieldSetLiteTest extends TestCase {
    @Override
    public void setUp() throws Exception {
      allFields = TestUtil.getAllSet();
      allFieldsData = allFields.toByteString();
      emptyMessage = TestEmptyMessage.parseFrom(allFieldsData);
      unknownFields = emptyMessage.getUnknownFields();
    }
  
    TestAllTypes allFields;
    ByteString allFieldsData;
  
    // Constructs a protocol buffer which contains fields with all the same
    // numbers as allFieldsData except that each field is some other wire
    // type.
    private ByteString getBizarroData() throws Exception {
      UnknownFieldSet.Builder bizarroFields = UnknownFieldSet.newBuilder();
  
      UnknownFieldSet.Field varintField = UnknownFieldSet.Field.newBuilder().addVarint(1).build();
      UnknownFieldSet.Field fixed32Field = UnknownFieldSet.Field.newBuilder().addFixed32(1).build();
  
      for (Map.Entry<Integer, UnknownFieldSet.Field> entry : unknownFields.asMap().entrySet()) {
        if (entry.getValue().getVarintList().isEmpty()) {
          // Original field is not a varint, so use a varint.
          bizarroFields.addField(entry.getKey(), varintField);
        } else {
          // Original field *is* a varint, so use something else.
          bizarroFields.addField(entry.getKey(), fixed32Field);
        }
      }
  
      return bizarroFields.build().toByteString();
    }
  
    // An empty message that has been parsed from allFieldsData.  So, it has
    // unknown fields of every type.
    TestEmptyMessage emptyMessage;
    UnknownFieldSet unknownFields;
  
    public void testDefaultInstance() {
      UnknownFieldSetLite unknownFields = UnknownFieldSetLite.getDefaultInstance();
  
      assertEquals(0, unknownFields.getSerializedSize());
      assertEquals(ByteString.EMPTY, toByteString(unknownFields));
    }
  
    public void testEmptyInstance() {
      UnknownFieldSetLite instance = UnknownFieldSetLite.newInstance();
  
      assertEquals(0, instance.getSerializedSize());
      assertEquals(ByteString.EMPTY, toByteString(instance));
      assertEquals(UnknownFieldSetLite.getDefaultInstance(), instance);
    }
  
    public void testMergeFieldFrom() throws IOException {
      Foo foo = Foo.newBuilder()
        .setValue(2)
        .build();
  
      CodedInputStream input = CodedInputStream.newInstance(foo.toByteArray());
  
      UnknownFieldSetLite instance = UnknownFieldSetLite.newInstance();
      instance.mergeFieldFrom(input.readTag(), input);
  
      assertEquals(foo.toByteString(), toByteString(instance));
    }
  
    public void testSerializedSize() throws IOException {
      Foo foo = Foo.newBuilder()
        .setValue(2)
        .build();
  
      CodedInputStream input = CodedInputStream.newInstance(foo.toByteArray());
  
      UnknownFieldSetLite instance = UnknownFieldSetLite.newInstance();
      instance.mergeFieldFrom(input.readTag(), input);
  
      assertEquals(foo.toByteString().size(), instance.getSerializedSize());
    }
  
    public void testMergeVarintField() throws IOException {
      UnknownFieldSetLite unknownFields = UnknownFieldSetLite.newInstance();
      unknownFields.mergeVarintField(10, 2);
  
      CodedInputStream input =
          CodedInputStream.newInstance(toByteString(unknownFields).toByteArray());
  
      int tag = input.readTag();
      assertEquals(10, WireFormat.getTagFieldNumber(tag));
      assertEquals(WireFormat.WIRETYPE_VARINT, WireFormat.getTagWireType(tag));
      assertEquals(2, input.readUInt64());
      assertTrue(input.isAtEnd());
    }
  
    public void testMergeVarintField_negative() throws IOException {
      UnknownFieldSetLite builder = UnknownFieldSetLite.newInstance();
      builder.mergeVarintField(10, -6);
  
      CodedInputStream input =
          CodedInputStream.newInstance(toByteString(builder).toByteArray());
  
      int tag = input.readTag();
      assertEquals(10, WireFormat.getTagFieldNumber(tag));
      assertEquals(WireFormat.WIRETYPE_VARINT, WireFormat.getTagWireType(tag));
      assertEquals(-6, input.readUInt64());
      assertTrue(input.isAtEnd());
    }
  
    public void testEqualsAndHashCode() {
      UnknownFieldSetLite unknownFields1 = UnknownFieldSetLite.newInstance();
      unknownFields1.mergeVarintField(10, 2);
  
      UnknownFieldSetLite unknownFields2 = UnknownFieldSetLite.newInstance();
      unknownFields2.mergeVarintField(10, 2);
  
      assertEquals(unknownFields1, unknownFields2);
      assertEquals(unknownFields1.hashCode(), unknownFields2.hashCode());
      assertFalse(unknownFields1.equals(UnknownFieldSetLite.getDefaultInstance()));
      assertFalse(unknownFields1.hashCode() == UnknownFieldSetLite.getDefaultInstance().hashCode());
    }
  
    public void testMutableCopyOf() throws IOException {
      UnknownFieldSetLite unknownFields = UnknownFieldSetLite.newInstance();
      unknownFields.mergeVarintField(10, 2);
      unknownFields = UnknownFieldSetLite.mutableCopyOf(unknownFields, unknownFields);
      unknownFields.checkMutable();
  
      CodedInputStream input =
          CodedInputStream.newInstance(toByteString(unknownFields).toByteArray());
  
      int tag = input.readTag();
      assertEquals(10, WireFormat.getTagFieldNumber(tag));
      assertEquals(WireFormat.WIRETYPE_VARINT, WireFormat.getTagWireType(tag));
      assertEquals(2, input.readUInt64());
      assertFalse(input.isAtEnd());
      input.readTag();
      assertEquals(10, WireFormat.getTagFieldNumber(tag));
      assertEquals(WireFormat.WIRETYPE_VARINT, WireFormat.getTagWireType(tag));
      assertEquals(2, input.readUInt64());
      assertTrue(input.isAtEnd());
    }
  
    public void testMutableCopyOf_empty() {
      UnknownFieldSetLite unknownFields = UnknownFieldSetLite.mutableCopyOf(
          UnknownFieldSetLite.getDefaultInstance(), UnknownFieldSetLite.getDefaultInstance());
      unknownFields.checkMutable();
  
      assertEquals(0, unknownFields.getSerializedSize());
      assertEquals(ByteString.EMPTY, toByteString(unknownFields));
    }
  
    public void testRoundTrips() throws InvalidProtocolBufferException {
      Foo foo = Foo.newBuilder()
          .setValue(1)
          .setExtension(Bar.fooExt, Bar.newBuilder()
              .setName("name")
              .build())
          .setExtension(LiteEqualsAndHash.varint, 22)
          .setExtension(LiteEqualsAndHash.fixed32, 44)
          .setExtension(LiteEqualsAndHash.fixed64, 66L)
          .setExtension(LiteEqualsAndHash.myGroup, LiteEqualsAndHash.MyGroup.newBuilder()
              .setGroupValue("value")
              .build())
          .build();
  
      Foo copy = Foo.parseFrom(foo.toByteArray());
  
      assertEquals(foo.getSerializedSize(), copy.getSerializedSize());
      assertFalse(foo.equals(copy));
  
      Foo secondCopy = Foo.parseFrom(foo.toByteArray());
      assertEquals(copy, secondCopy);
  
      ExtensionRegistryLite extensionRegistry = ExtensionRegistryLite.newInstance();
      LiteEqualsAndHash.registerAllExtensions(extensionRegistry);
      Foo copyOfCopy = Foo.parseFrom(copy.toByteArray(), extensionRegistry);
  
      assertEquals(foo, copyOfCopy);
    }
  
    public void testMalformedBytes() throws Exception {
      try {
        Foo.parseFrom("this is a malformed protocol buffer".getBytes(Internal.UTF_8));
        fail();
      } catch (InvalidProtocolBufferException e) {
        // Expected.
      }
    }
  
    public void testMissingStartGroupTag() throws IOException {
      ByteString.Output byteStringOutput = ByteString.newOutput();
      CodedOutputStream output = CodedOutputStream.newInstance(byteStringOutput);
      output.writeGroupNoTag(Foo.newBuilder().setValue(11).build());
      output.writeTag(100, WireFormat.WIRETYPE_END_GROUP);
      output.flush();
  
      try {
        Foo.parseFrom(byteStringOutput.toByteString());
        fail();
      } catch (InvalidProtocolBufferException e) {
        // Expected.
      }
    }
  
    public void testMissingEndGroupTag() throws IOException {
      ByteString.Output byteStringOutput = ByteString.newOutput();
      CodedOutputStream output = CodedOutputStream.newInstance(byteStringOutput);
      output.writeTag(100, WireFormat.WIRETYPE_START_GROUP);
      output.writeGroupNoTag(Foo.newBuilder().setValue(11).build());
      output.flush();
  
      try {
        Foo.parseFrom(byteStringOutput.toByteString());
        fail();
      } catch (InvalidProtocolBufferException e) {
        // Expected.
      }
    }
  
    public void testMismatchingGroupTags() throws IOException {
      ByteString.Output byteStringOutput = ByteString.newOutput();
      CodedOutputStream output = CodedOutputStream.newInstance(byteStringOutput);
      output.writeTag(100, WireFormat.WIRETYPE_START_GROUP);
      output.writeGroupNoTag(Foo.newBuilder().setValue(11).build());
      output.writeTag(101, WireFormat.WIRETYPE_END_GROUP);
      output.flush();
  
      try {
        Foo.parseFrom(byteStringOutput.toByteString());
        fail();
      } catch (InvalidProtocolBufferException e) {
        // Expected.
      }
    }
  
    public void testTruncatedInput() {
      Foo foo = Foo.newBuilder()
          .setValue(1)
          .setExtension(Bar.fooExt, Bar.newBuilder()
              .setName("name")
              .build())
          .setExtension(LiteEqualsAndHash.varint, 22)
          .setExtension(LiteEqualsAndHash.myGroup, LiteEqualsAndHash.MyGroup.newBuilder()
              .setGroupValue("value")
              .build())
          .build();
  
      try {
        Foo.parseFrom(foo.toByteString().substring(0, foo.toByteString().size() - 10));
        fail();
      } catch (InvalidProtocolBufferException e) {
        // Expected.
      }
    }
    
    public void testMakeImmutable() throws Exception {
      UnknownFieldSetLite unknownFields = UnknownFieldSetLite.newInstance();
      unknownFields.makeImmutable();
      
      try {
        unknownFields.mergeVarintField(1, 1);
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      try {
        unknownFields.mergeLengthDelimitedField(2, ByteString.copyFromUtf8("hello"));
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      try {
        unknownFields.mergeFieldFrom(1, CodedInputStream.newInstance(new byte[0]));
        fail();
      } catch (UnsupportedOperationException expected) {}
    }
    
    public void testEndToEnd() throws Exception {
      TestAllTypesLite testAllTypes = TestAllTypesLite.getDefaultInstance();
      try {
        testAllTypes.unknownFields.checkMutable();
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      testAllTypes = TestAllTypesLite.parseFrom(new byte[0]);
      try {
        testAllTypes.unknownFields.checkMutable();
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      testAllTypes = TestAllTypesLite.newBuilder().build();
      try {
        testAllTypes.unknownFields.checkMutable();
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      testAllTypes = TestAllTypesLite.newBuilder()
          .setDefaultBool(true)
          .build();
      try {
        testAllTypes.unknownFields.checkMutable();
        fail();
      } catch (UnsupportedOperationException expected) {}
      
      TestAllExtensionsLite testAllExtensions = TestAllExtensionsLite.newBuilder()
          .mergeFrom(TestAllExtensionsLite.newBuilder()
              .setExtension(UnittestLite.optionalInt32ExtensionLite, 2)
              .build().toByteArray())
          .build();
      try {
        testAllExtensions.unknownFields.checkMutable();
        fail();
      } catch (UnsupportedOperationException expected) {}
    }
  
    private ByteString toByteString(UnknownFieldSetLite unknownFields) {
      ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
      CodedOutputStream output = CodedOutputStream.newInstance(byteArrayOutputStream);
      try {
        unknownFields.writeTo(output);
        output.flush();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return ByteString.copyFrom(byteArrayOutputStream.toByteArray());
    }
  
    public void testSerializeLite() throws Exception {
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
      assertEquals(allFieldsData.size(), emptyMessageLite.getSerializedSize());
      ByteString data = emptyMessageLite.toByteString();
      TestAllTypes message = TestAllTypes.parseFrom(data);
      TestUtil.assertAllFieldsSet(message);
      assertEquals(allFieldsData, data);
    }
  
    public void testAllExtensionsLite() throws Exception {
      TestAllExtensions allExtensions = TestUtil.getAllExtensionsSet();
      ByteString allExtensionsData = allExtensions.toByteString();
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parser().parseFrom(allExtensionsData);
      ByteString data = emptyMessageLite.toByteString();
      TestAllExtensions message = TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
      TestUtil.assertAllExtensionsSet(message);
      assertEquals(allExtensionsData, data);
    }
  
    public void testAllPackedFieldsLite() throws Exception {
      TestPackedTypes allPackedFields = TestUtil.getPackedSet();
      ByteString allPackedData = allPackedFields.toByteString();
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(allPackedData);
      ByteString data = emptyMessageLite.toByteString();
      TestPackedTypes message = TestPackedTypes.parseFrom(data, TestUtil.getExtensionRegistry());
      TestUtil.assertPackedFieldsSet(message);
      assertEquals(allPackedData, data);
    }
  
    public void testAllPackedExtensionsLite() throws Exception {
      TestPackedExtensions allPackedExtensions = TestUtil.getPackedExtensionsSet();
      ByteString allPackedExtensionsData = allPackedExtensions.toByteString();
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(allPackedExtensionsData);
      ByteString data = emptyMessageLite.toByteString();
      TestPackedExtensions message =
          TestPackedExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
      TestUtil.assertPackedExtensionsSet(message);
      assertEquals(allPackedExtensionsData, data);
    }
  
    public void testCopyFromLite() throws Exception {
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
      UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
          UnittestLite.TestEmptyMessageLite.newBuilder().mergeFrom(emptyMessageLite).build();
      assertEquals(emptyMessageLite.toByteString(), emptyMessageLite2.toByteString());
    }
  
    public void testMergeFromLite() throws Exception {
      TestAllTypes message1 =
          TestAllTypes.newBuilder()
              .setOptionalInt32(1)
              .setOptionalString("foo")
              .addRepeatedString("bar")
              .setOptionalNestedEnum(TestAllTypes.NestedEnum.BAZ)
              .build();
  
      TestAllTypes message2 =
          TestAllTypes.newBuilder()
              .setOptionalInt64(2)
              .setOptionalString("baz")
              .addRepeatedString("qux")
              .setOptionalForeignEnum(ForeignEnum.FOREIGN_BAZ)
              .build();
  
      ByteString data1 = message1.toByteString();
      UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
          UnittestLite.TestEmptyMessageLite.parseFrom(data1);
      ByteString data2 = message2.toByteString();
      UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
          UnittestLite.TestEmptyMessageLite.parseFrom(data2);
  
      message1 = TestAllTypes.newBuilder(message1).mergeFrom(message2).build();
      emptyMessageLite1 =
          UnittestLite.TestEmptyMessageLite.newBuilder(emptyMessageLite1)
              .mergeFrom(emptyMessageLite2)
              .build();
  
      data1 = emptyMessageLite1.toByteString();
      message2 = TestAllTypes.parseFrom(data1);
  
      assertEquals(message1, message2);
    }
  
    public void testWrongTypeTreatedAsUnknownLite() throws Exception {
      // Test that fields of the wrong wire type are treated like unknown fields
      // when parsing.
  
      ByteString bizarroData = getBizarroData();
      TestAllTypes allTypesMessage = TestAllTypes.parseFrom(bizarroData);
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
      ByteString data = emptyMessageLite.toByteString();
      TestAllTypes allTypesMessage2 = TestAllTypes.parseFrom(data);
  
      assertEquals(allTypesMessage.toString(), allTypesMessage2.toString());
    }
  
    public void testUnknownExtensionsLite() throws Exception {
      // Make sure fields are properly parsed to the UnknownFieldSet even when
      // they are declared as extension numbers.
  
      UnittestLite.TestEmptyMessageWithExtensionsLite message =
          UnittestLite.TestEmptyMessageWithExtensionsLite.parseFrom(allFieldsData);
  
      assertEquals(allFieldsData, message.toByteString());
    }
  
    public void testWrongExtensionTypeTreatedAsUnknownLite() throws Exception {
      // Test that fields of the wrong wire type are treated like unknown fields
      // when parsing extensions.
  
      ByteString bizarroData = getBizarroData();
      TestAllExtensions allExtensionsMessage = TestAllExtensions.parseFrom(bizarroData);
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
  
      // All fields should have been interpreted as unknown, so the byte strings
      // should be the same.
      assertEquals(emptyMessageLite.toByteString(), allExtensionsMessage.toByteString());
    }
  
    public void testParseUnknownEnumValueLite() throws Exception {
      Descriptors.FieldDescriptor singularField =
          TestAllTypes.getDescriptor().findFieldByName("optional_nested_enum");
      Descriptors.FieldDescriptor repeatedField =
          TestAllTypes.getDescriptor().findFieldByName("repeated_nested_enum");
      assertNotNull(singularField);
      assertNotNull(repeatedField);
  
      ByteString data =
          UnknownFieldSet.newBuilder()
              .addField(
                  singularField.getNumber(),
                  UnknownFieldSet.Field.newBuilder()
                      .addVarint(TestAllTypes.NestedEnum.BAR.getNumber())
                      .addVarint(5) // not valid
                      .build())
              .addField(
                  repeatedField.getNumber(),
                  UnknownFieldSet.Field.newBuilder()
                      .addVarint(TestAllTypes.NestedEnum.FOO.getNumber())
                      .addVarint(4) // not valid
                      .addVarint(TestAllTypes.NestedEnum.BAZ.getNumber())
                      .addVarint(6) // not valid
                      .build())
              .build()
              .toByteString();
  
      UnittestLite.TestEmptyMessageLite emptyMessageLite =
          UnittestLite.TestEmptyMessageLite.parseFrom(data);
      data = emptyMessageLite.toByteString();
  
      {
        TestAllTypes message = TestAllTypes.parseFrom(data);
        assertEquals(TestAllTypes.NestedEnum.BAR, message.getOptionalNestedEnum());
        assertEquals(
            Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
            message.getRepeatedNestedEnumList());
        assertEquals(
            Arrays.asList(5L),
            message.getUnknownFields().getField(singularField.getNumber()).getVarintList());
        assertEquals(
            Arrays.asList(4L, 6L),
            message.getUnknownFields().getField(repeatedField.getNumber()).getVarintList());
      }
  
      {
        TestAllExtensions message =
            TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
        assertEquals(
            TestAllTypes.NestedEnum.BAR,
            message.getExtension(UnittestProto.optionalNestedEnumExtension));
        assertEquals(
            Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
            message.getExtension(UnittestProto.repeatedNestedEnumExtension));
        assertEquals(
            Arrays.asList(5L),
            message.getUnknownFields().getField(singularField.getNumber()).getVarintList());
        assertEquals(
            Arrays.asList(4L, 6L),
            message.getUnknownFields().getField(repeatedField.getNumber()).getVarintList());
      }
    }
  
    public void testClearLite() throws Exception {
      UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
          UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
      UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
          UnittestLite.TestEmptyMessageLite.newBuilder().mergeFrom(emptyMessageLite1).clear().build();
      assertEquals(0, emptyMessageLite2.getSerializedSize());
      ByteString data = emptyMessageLite2.toByteString();
      assertEquals(0, data.size());
    }
  }
  